Waveguide probe loaded with split-ring resonators for crack detection in metallic surfaces

Bing Hu, Zhao Ren, Muhammed S. Boybay, Omar M. Ramahi

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

We present a near-field waveguide probe with an embedded array of split-ring resonators (SRRs) that operate at 16.65 GHz. When the probe scans a metal surface, the magnetic flux generated from the currents on the metallic surface strongly affects the equivalent lumped parameters of the SRRs. This, in turn, affects the reflection coefficient of the feeding port leading to high sensitivity in detecting anomalies such as cracks in the surface. Experimental results indicated the feasibility of detecting cracks, as small as 25 μm in width, in metallic surfaces. Additionally, the probe achieves good resolution in detecting closely spaced cracks.

Original languageEnglish
Article number6763023
Pages (from-to)871-878
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume62
Issue number4
DOIs
Publication statusPublished - Apr 2014

Keywords

  • Near-field microscopy
  • near-field probes
  • split-ring resonators (SRRs)
  • sub-wavelength resolution
  • wave guides

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